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The problem is not _____ easy. Think _____ over.?

A. such, it　　　 B. that, it?　 C. so,不填　　　 D. that，不填

The problem is not _____ easy. Think _____ over.?

A. such; it                     B. that; it?                C. so; /                           D. that; /

The problem is not _____ easy. Think _____ over.?

　　A. such, it        B. that, it?    C. so,不填       D. that，不填

The problem is not _____ easy. Think _____ over.?

　　A. such, it        B. that, it?    C. so,不填       D. that，不填